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Calipers.
Patent for calipers that make it easier to read measurements, by having a strip of measuring tape at the ends that allows users to determine the distance between the arms easier. The measuring tape component is also retractable.
Date:
April 4, 1922
Creator:
Miller, William James
System:
The Portal to Texas History
Photoprinter.
Patent for a photograph printer that includes a mask mechanism to create prints of different sizes. Construction is such that the person using the printer can work the printer accurately and quickly complete work.
Date:
April 11, 1922
Creator:
Lockhart, William E.
System:
The Portal to Texas History
Wrench
Patent for an improvement in the design of wrenches, particular for heavy work such as deep well drilling, but still being able to be designed at smaller sizes to handle lighter work.
Date:
April 11, 1922
Creator:
Reed, Clarence E.
System:
The Portal to Texas History